This series is a masterpiece. It gets down to the depths of humanity while portraying white, black, and gray within humanity's painting. I've also noticed countless biblical symbols within the series. For example, lets take satan, and see what the Bible has to characterize with.

Satan:

(Other names include)

-Lucifer
-The Devil
-The Father of lies
-The Prince of darkness

The Bible also says these other details about satan.

"He was the most beautiful angel"
"He will come to you as an angel of light"
"He will make sin look appealing"
"He will appear as a friend, only to stab you in the back"
"He comes only to steal, to kill, and to destroy"